Re: [PATCH] [RFC] Revert "mmc: core: Fixup support for writeback-cache for eMMC and SD"

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On 6/16/23 12:33, Ulf Hansson wrote:

Hi,

[...]

I have been trying to follow the progress around this matter. If I
understand correctly we are leaning towards making a card quirk for
this particular SD, to avoid us from turning on and using a broken
cache feature.

Or what are you thinking?

That is probably the simplest option.

Just give me a day or two to test the other newer card.

What would you base that quirk off of ? Date ? We don't know when the
"fixed" cards started to be produced .

Right. It seems like the best we can do is to make a quirk for that
particular version of card that you proved to have failed.

I just sent a few more data points . It is either date, or C_SIZE, or
ERASE_TIMEOUT (if I decode it right). I can also just archive the card,
since we have sample size of the defective card equal 1 . It could just
be a defective card after all, although the fact that only cache would
be defective is unusual.

I wouldn't mind having a card quirk and to use "date". But it looks
like it's your call to make. :-)

I sent the quirk patch:

[PATCH] mmc: Add MMC_QUIRK_BROKEN_SD_CACHE for Kingston Canvas Go Plus from 11/2019

It seems it is a bit bigger than I though it would originally be.



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